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/sci/ Science & Math

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Most viewed threads in this category

24 more posts in this thread. [Missing image file: ]
A serious question regarding the "Out of Africa" theory. I know there are some people out there who dispute this theory in support of "Multiregional theory", but my question is how much credibility do both theories have and if the former one has more evidence than the latter, why do so many people go out of their way to discredit the former? I never taken an anthropology class so my knowledge of evolution is limited.
6 more posts in this thread. [Missing image file: ]
Can a coma patient remember things from the period he was in a coma?
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What search algorithms does the brain use?
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I found out how to make freestyle numeric systems. I don't know whether people do this already, but I thought it was interesting and uncommon enough to post. You can combine Base-2, Base-3, Base-4, etc. in any order you want. First, pick a random string of numbers as long as you need, all between 2 and infinity. As an example; 5, 3, 8, 7, 2. So, to write in the base system 5, 3, 8, 7, 2. First digit of a number is in base 5, next is base 3, and so on through the array. So the appearance of each digit would be 0-4, 0-2, 0-7, 0-6, 0-1. The value of each digit can be found by creating a new array like so: 5, 5*3, 5*3*8, 5*3*8*7, 5*3*8*7*2 And putting a 1 on the left. So we get: 1, 5, 15, 120, 840, 1680. So if I have 31051 written in base 5, 3, 8, 7, 2, the value of it can be worked out by aligning that last array with each digit: 3*1+ 1*5+ 0*15+ 5*120+ 1*840= 1568 And I've checked that this only has one way of writing each number. I haven't checked how this would work with non-integers though. And is this all even useful?
3 more posts in this thread. [Missing image file: ]
Can genetics prevent you from losing weight? I see that used in arguments a lot. And does being fat mean you're automatically unhealthy?
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I am doing first year statistics and I could use some experienced eyes to look at a question. I am not looking for someone to do my home work I just do not understand what is asked of this question. I have answered EVERYTHING for this question except part (d). I just don't know what she wants. I have included all parts up to (d) just to know what was already asked. Thanks /sci/ Market research has indicated that customers are likely to bypass Roma tomatoes that weigh less than 70 grams. A produce company produces Roma tomatoes that average 74.0 grams with a standard deviation of 3.2 grams. (a) [2 marks] Assuming that the normal distribution is a reasonable model for the weights of these tomatoes, what proportion of Roma tomatoes are currently undersize (less than 70g)? (b) [2 marks] How much must a Roma tomato weigh to be among the heaviest 10%? (c) [2 marks] The aim of the current research is to reduce the proportion of undersized tomatoes to no more than 2%. One way of reducing this proportion is to reduce the standard deviation. If the average size of the tomatoes remains 74.0 grams, what must the target standard deviation be to achieve the 2% goal? (d) [3 marks] The company claims that the goal of 2% undersized tomatoes is reached. To test this, a random sample of 25 tomatoes is taken. What is the distribution of 1 the number of undersized tomatoes in this sample if the company's claim is true? Explain your reasoning.


26 more posts in this thread. [Missing image file: ]
Thoughts on what's been posted in this thread? >>>/r9k/13472569


19 more posts in this thread. [Missing image file: ]
/sci/entists, how fucked are we? >WASHINGTON (AP) -- An extreme solar flare is blasting its way to Earth and could mess up some power grids, satellites and radio transmissions, scientists say. >It's been several years since Earth has had a solar storm of this size coming from sunspots smack in the middle of the sun, said Tom Berger, director of the Space Weather Prediction Center in Boulder, Colorado. http://hosted.ap.org/dynamic/stories/U/US_SCI_SOLAR_STORM?SITE=AP&SECTION=HOME&TEMPLATE=DEFAULT&CTIME=2014-09-10-17-56-39
38 more posts in this thread. [Missing image file: ]
Are there really more women on this entire planet than men or is this just a myth? The title is a reference to an old saying that is statistically impossible.
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I am a first year physics student so forgive me if my question is elementary. Today during my physics lecture the prof. said that acceleration is relative to the initial acceleration. Is it not relative to the point just before the current acceleration. For example, if you accelerate from rest to 10m/s^2 then decelerate to 5m/s^2 is not your acceleration decreasing? Do you know what he meant by this being relative to the initial acceleration?
2 more posts in this thread. [Missing image file: ]
https://www.youtube.com/watch?v=_439AGRF4FU Alright I'm not a physics guy but what the hell is he trying to say here
2 more posts in this thread. [Missing image file: ]
There's something about evolution I can't get my head around, I wondered if /sci/ could help clarify. Let's say there's an animal, let's call it an Anonysaurus, this animal is preyed upon by large carnivores. Anonysaurus develops an armored shell to protect it's body from predators, we see examples of that in nature, a turtle, a pangolin, an ankylosaurus, etc. My question is, if the armored shell is necessary for it's survival, or is at least extremely beneficial, how do the preceding generations survive long enough for that trait to evolve? I understand that evolution does is not reactionary, animals do not develop traits in response to external stimuli, but small mutations that give the animal an advantage allow it to survive longer and breed more, eventually influencing the gene pool. These mutations are very small though, am I to believe that, in the case of the pangolin, a small mutation was enough to protect the otherwise naked animal from predators? Similarly turtles did not suddenly grow protective shells over one generation. I could ask the same question of flight, there has to be a transitional point where an animal's arms of are no use for anything. Raptors did not grow feathers and suddenly begin jumping out of trees. So what is it I'm not getting?
17 more posts in this thread. [Missing image file: ]
Other than the fact of it being prime and symmetrical what are some other interesting aspects of this number? 1231507051321
6 more posts in this thread. [Missing image file: ]
Could Somebody explain to me what he means with "the quantatiy of naptha should be at least 10% of the volume of basified root bark" im not sure if I'm understanding him correctly.
8 more posts in this thread. [Missing image file: ]
hi /sci/. what is this? Pic related

Math exercise

16 more posts in this thread. [Missing image file: ]
Sup /sci/, I can't figure this out on my own. I have to find f(x), where f(x) is bound to the next rules: 1. It's continuous from x=0..1 2. It's differentiable from x=0..1 3. f(0) = f(1) = 0 4. for 0 < x < 1; f(x) >0 5. the integral of f from x=0..1 equals 1 6. f(0.25) = 1 Anyone knows how to solve this, i was thinking this: f(x) = -a*x^b*(x-1) But I cant seem to find the right values for a and b Pic related, it's -a*x^b*(x-1)
19 more posts in this thread. [Missing image file: ]
this was posted on /b/ in a troll science thread. but doesn't it pose a serious question?

NASA Scientist says Solar Storm could detonate nuclear weapons

5 more posts in this thread. [Missing image file: ]
http://foxweekly.com/2014/09/11/science/nasa-scientist-says-solar-storm-could-detonate-nuclear-weapons.html Foxweekly interview with Greg Smidt
6 more posts in this thread. [Missing image file: ]
Hi! So I started a new folder called MEGA Folder which will containg a lot of gb's of helpful files. My current folders are: Physics, Chemistry, Astronomy, Biology, Electronics>Electronic Components and software tutorials(.pdf, videos etc.) for photoshop cc, premiere, arduino, blender, c#, excel, powerpoint, python, sketchup, unity and word. What else folders should I add. When I finish it I will upload it and post it here.
18 more posts in this thread. [Missing image file: ]
What would heat up faster in sunlight? A white board or a mirror?

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